15
Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev P • 09/28/15
6 ft (1.83 m) max.
unsupported chimney
above roof
35 ft (10.7 m)
max. straight
unsupported
chimney height
18.5 ft (5.64 m)
min. height
single offset-return
90 ft (27.4 m)
max. height
14-11
Transition
20 ft (6.10 m) max.
pipe between an
offset & return
Ceiling firestop
Attic Insulation
Shield
97 1/2 in.
(2477 mm)
Effective
Height
Figure 4.1 Chimney Requirements
NOTICE:
A maximum of two pairs of offsets and returns
may be used.
WARNING! Risk of Fire!
You must maintain 2 in. (51 mm)
air space clearance to insulation and other combustible
materials around the chimney system. Failure to do so
may cause overheating and fire.
NOTICE
: You must provide support for the pipe during
construction and check to be sure inadvertent loading has
not dislodged the chimney section from the fireplace or at
any chimney joint.
A. Chimney Requirements
Vertical distances are measured from the base of the
fireplace as shown in Figure 4.1.
4
Chimney and Termination Requirements
Table 4.2 Chimney Component Dimensions
Table 4.1 Chimney Requirements
• Minimum overall straight height
18 ft
(5.5 m)
• Minimum height with offset/return
18.5 ft
(5.64 m)
• Maximum height
90 ft
(27.43 m)
• Maximum chimney length between an offset
and return
20 ft
(6.1 m)
• Maximum distance between chimney
stabilizers
35 ft
(10.67 m)
• Maximum unsupported chimney length
between the offset and return
6 ft
(1.83 m)
• Maximum unsupported chimney height above
the fireplace
35 ft
(10.67 m)
• Maximum unsupported chimney above roof
6 ft
(1.83 m)
• Minimum height with double offset/return
22.5 ft
(6.86 m)
HEIGHT OF CHIMNEY COMPONENTS
in.
mm
Chimney Stabilizer
SL11
4-3/4
121
Offsets/Returns
SL1130
18
457
Chimney Sections*
SL1106
4-3/4
121
SL1112
10-3/4
273
SL1118
16-3/4
425
SL1136
34-3/4
883
SL1148
46-3/4
1187
* Dimensions reflect effective height.
